https://bugs.kde.org/show_bug.cgi?id=407829

            Bug ID: 407829
           Summary: kdiff3 1.8.1 crash during scroll when comparing
                    directories
           Product: kdiff3
           Version: 1.8.x
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: application
          Assignee: reeves...@gmail.com
          Reporter: yermolc...@gmail.com
  Target Milestone: ---

SUMMARY
kdiff3 1.8.1 release crash when I scroll to beginning or end of file list
comparing any two directories.

STEPS TO REPRODUCE
I)
1. kdiff3 dir1 dir2
2. Scroll using mouse wheel or keyboard over list of files
or
II)
1. kdiff3 dir1 dir2
2. Select first file in the list
3. Press up arrow key


OBSERVED RESULT
Segmentation fault.

EXPECTED RESULT
Just stop scrolling at the end of list.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: OpenSUSE Leap 15.1
KDE Plasma Version: 5.14.4-lp151.1.1
KDE Frameworks Version: 5.55.0-lp151.1.1
Qt Version: 5.9.7-lp151.3.1

ADDITIONAL INFORMATION
I)
Thread 1 (Thread 0x7f8025b09440 (LWP 5719)):
[KCrash Handler]
#6  0x00007f802342fba0 in QAbstractSlider::value() const () from
/usr/lib64/libQt5Widgets.so.5
#7  0x000056133b8be87b in ?? ()
#8  0x00007f8023379be8 in QWidget::event(QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#9  0x00007f802333b3dc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQt5Widgets.so.5
#10 0x00007f80233446c7 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#11 0x00007f80225918d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib64/libQt5Core.so.5

II)
Thread 1 (Thread 0x7f314c839440 (LWP 19115)):
[KCrash Handler]
#6  0x00007f314a15fba0 in QAbstractSlider::value() const () from
/usr/lib64/libQt5Widgets.so.5
#7  0x000056475209185b in KDiff3App::scrollDiffTextWindow(int, int) ()
#8  0x00007f314a0aa417 in QWidget::event(QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#9  0x00007f314a06b3dc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib64/libQt5Widgets.so.5
#10 0x00007f314a0741e2 in QApplication::notify(QObject*, QEvent*) () from
/usr/lib64/libQt5Widgets.so.5
#11 0x00007f31492c18d8 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib64/libQt5Core.so.5

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